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Section four

The Ocean Explorer quiz

Twelve questions. Every answer is somewhere in Ocean Explorers, and every one is explained after you choose. Get eight or more and you can print your certificate.

Nothing you type here leaves your device. There is no sign-up, no account and no tracking. Your name is only used to draw the certificate on your own screen, and it disappears when you close the page.

Question 1 of 12

An octopus has how many hearts?

Three — two pump blood to the gills and one to the rest of the body.

Question 2 of 12

Which of these is NOT a fish?

A dolphin is a mammal. It breathes air, is born alive and drinks its mother's milk.

Question 3 of 12

What is white sand on a coral beach mostly made of?

Parrotfish scrape algae off coral, digest it, and pass out the rock as fine white sand.

Question 4 of 12

Why does coral turn white?

Warm water makes coral expel the algae that feed it. That is bleaching, and the coral is starving.

Question 5 of 12

What is the Swahili name for octopus?

Pweza. Pomboo is dolphin and papa is shark.

Question 6 of 12

Which wind blows from the north-east from about November to March?

The Kaskazi. The Kusi blows from the south-east, roughly April to October.

Question 7 of 12

Seagrass is...

A true flowering plant with roots and seeds, which returned to the sea about a hundred million years ago.

Question 8 of 12

Which parent seahorse carries the eggs?

The father. The female places her eggs in his pouch and he carries them until they hatch.

Question 9 of 12

What decides whether turtle hatchlings are male or female?

Sand temperature. Warmer sand produces more females.

Question 10 of 12

How many bones does a shark have?

None. A shark's whole skeleton is cartilage — the bendy material in your ear.

Question 11 of 12

Why do mangrove roots arch above the mud?

So the tree can take in air when the tide covers the mud.

Question 12 of 12

Which is usually the more sustainable choice?

Sardines. They breed fast and in huge numbers, while a big grouper took many years to grow.